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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b9cbfffd7628cb7d1a8b4e07bb37cc57af01cea6f3057a2b6d8fca90670bf5' 
  AND token = 'wSqFljCDLgFyLmdmuRnXGJhUjmCfSaXrX4+wU79NtI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}